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def __str__(self):
""" (Country) -> str
Return a printable representation of this country.
>>> usa = Country('United States of America', 313914040, 9826675)
>>> print(usa)
United States of America has a population of 313914040 and is 9826675 square km.
"""
return '{} has a population of {} and is {} square km.'.format(
self.name, self.population, self.area)